We're dividing 378186 by 15 
Let's see how many times 15 fits into 378186.

Let's proceed to step 1:
The number 15 fits into 3 0 times, leaving a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Append the next digit (7) from the dividend to 3 and continue with: 37 / 15

Step 2:
15 goes into 37 2 times with a remainder of 7.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 30 from 37, we get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 15

Let's proceed to step 3:
78 divided by 15 is 5 with a remainder of 3.
Write down 5 as next digit of the result. 
Result so far: 25.0
Subtracting 75 from 78 leaves us with 3.
Include the next digit (1) from the dividend after 3, then repeat: 31 / 15

Advancing to step 4:
When dividing 31 by 15, we get 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 252.0
Deduct 30 from 31 and we're left with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 15

Going ahead to step 5:
18 divided by 15 is 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 2521.0
Subtracting 15 from 18 leaves us with 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 15

Let's proceed to step 6:
15 goes into 36 2 times with a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 25212.0
If we subtract 30 from 36, we get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 7:
15 goes into 60 4 times with a remainder of 0.
The number 4 becomes the next digit in our result. 
Result so far: 25212.4
If we take 60 away from 60, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 8:
0 divided by 15 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 25212.4
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
When dividing 0 by 15, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 25212.4
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 25212.4, with a leftover of 0.0.